Need Help With Arduino and Switches

Hi
My name is shadi an new to the Arduino and i wanted to do something for the first time ... so i started a project for controlling home applications using arduino and sim900 ... everything is going good but i wanted to do another thing which is controlling the lights through the arduino and with a normal switch ... if i switched the light on using sms i can turn it off using a manual switch and vise versa ... is this possible ? if yes can anybody help me with any suggestion ? or how to do it ?

thanks alot

note : sorry if this is not in the right section i really didnt know where to put this question ... thanks

Yes it's possible if you have a relay on attached to the arduino. You just need a regular single pole two way switch on the wall.

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